Added and replaced some UMAs

tools/metrics/histograms/histograms.xml

 <!--
 Copyright 2013 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
@@ skipping 8567 matching lines @@
   <summary>
     The time from injecting scripts for Chrome Translate to the finishing loads
     of all depending libraries.
   </summary>
 </histogram>
 
 <histogram name="Translate.TimeToTranslate" units="milliseconds">
   <summary>The time from starting translation to the completion.</summary>
 </histogram>
 
+<histogram name="Translate.UnavailableLanguage" enum="LanguageCode">
+  <summary>
+    A language which is not available for the user locale but reported by the
+    server.

[Takashi Toyoshima, 2013/05/21 11:11:43]

for the user locale -> to show in infobar UI in the user locale
but reported by the server -> but used by the translate server

[hajimehoshi, 2013/05/22 04:19:27]

Done.

+  </summary>
+</histogram>
+
+<histogram name="Translate.UnsupportedLanguageAtInitiation" enum="LanguageCode">
+  <summary>
+    An unsupported language for the translation. This is reported when the
+    translation is initialized.

[Takashi Toyoshima, 2013/05/21 11:11:43]

initialized -> going to be initiated

[hajimehoshi, 2013/05/22 04:19:27]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Translate.UserActionDuration" units="milliseconds">
   <summary>
     The time from a page content language being determined to user requesting
     Chrome Translate.
   </summary>
 </histogram>
 
 <histogram name="UMA.Perf.GetData" enum="GetPerfDataOutcome">
   <summary>
     A count of successes and various failure modes related to collecting and
@@ skipping 6655 matching lines @@
 <fieldtrial name="SSLResumption">
   <group name="Resume_Handshake" label="Session Resumption"/>
   <group name="Full_Handshake" label="Full"/>
   <affected-histogram name="Net.SSL_Connection_Latency"/>
   <affected-histogram name="Net.SSL_Connection_Latency_Google"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>